XGID=a--BBCBBA------Acb-dbcB---:0:0:1:00:8:11:0:13:10
Match Play. Red trails 8-11 to 13. Should Red double? If doubled, should White take?
This is an efficient double which if thing turn out well will give Red a gammon.
Conversely this is an easy take as White has a broken prime with two Red checkers trapped behind it. If Red doesn’t roll a four very soon he may well crash home board.
Not doubling is a blunder while dropping is a triple blunder.